package io.scy;

import org.mybatis.generator.api.CommentGenerator;
import org.mybatis.generator.api.IntrospectedTable;
import org.mybatis.generator.api.PluginAdapter;
import org.mybatis.generator.api.dom.java.Field;
import org.mybatis.generator.api.dom.java.JavaVisibility;
import org.mybatis.generator.api.dom.java.Method;
import org.mybatis.generator.api.dom.java.Parameter;
import org.mybatis.generator.api.dom.java.PrimitiveTypeWrapper;
import org.mybatis.generator.api.dom.java.TopLevelClass;
import org.mybatis.generator.api.dom.xml.Attribute;
import org.mybatis.generator.api.dom.xml.TextElement;
import org.mybatis.generator.api.dom.xml.XmlElement;

import java.util.List;

/**
 * Created by Administrator on 2017/3/19.
 */
public class MybatisGenPaginationPlugin extends PluginAdapter {

    public MybatisGenPaginationPlugin() {
        System.out.println("MybatisGenPaginationPlugin插件的无参构造执行了---");
    }

    /**
     * Example类
     */
    @Override
    public boolean modelExampleClassGenerated(TopLevelClass topLevelClass,
                                              IntrospectedTable introspectedTable) {
        System.out.println("MybatisGenPaginationPlugin插件的modelExampleClassGenerated执行了");
        // add field, getter, setter for limit clause
        addLimit(topLevelClass, introspectedTable, "limitStart");
        addLimit(topLevelClass, introspectedTable, "limitEnd");
        return super.modelExampleClassGenerated(topLevelClass,
                introspectedTable);
    }

    /**
     * 添加SQL支持
     */
    @Override
    public boolean sqlMapSelectByExampleWithoutBLOBsElementGenerated(
            XmlElement element, IntrospectedTable introspectedTable) {
        System.out.println("MybatisGenPaginationPlugin插件的sqlMapSelectByExampleWithoutBLOBsElementGenerated执行了");
//      XmlElement isParameterPresenteElemen = (XmlElement) element
//              .getElements().get(element.getElements().size() - 1);
        XmlElement isNotNullElement = new XmlElement("if"); //$NON-NLS-1$
        isNotNullElement.addAttribute(new Attribute("test", "limitStart != null and limitStart>=0")); //$NON-NLS-1$
        // $NON-NLS-2$
//      isNotNullElement.addAttribute(new Attribute("compareValue", "0")); //$NON-NLS-1$
// $NON-NLS-2$
        isNotNullElement.addElement(new TextElement(
                "limit #{limitStart} , #{limitEnd}"));
//      isParameterPresenteElemen.addElement(isNotNullElement);
        element.addElement(isNotNullElement);
        return super.sqlMapUpdateByExampleWithoutBLOBsElementGenerated(element,
                introspectedTable);
    }

    private void addLimit(TopLevelClass topLevelClass,
                          IntrospectedTable introspectedTable, String name) {

        System.out.println("MybatisGenPaginationPlugin插件的addLimit执行了");

        CommentGenerator commentGenerator = context.getCommentGenerator();
        Field field = new Field();
        field.setVisibility(JavaVisibility.PROTECTED);
//      field.setType(FullyQualifiedJavaType.getIntInstance());
        field.setType(PrimitiveTypeWrapper.getIntegerInstance());
        field.setName(name);
//      field.setInitializationString("-1");
        commentGenerator.addFieldComment(field, introspectedTable);
        topLevelClass.addField(field);
        char c = name.charAt(0);
        String camel = Character.toUpperCase(c) + name.substring(1);
        Method method = new Method();
        method.setVisibility(JavaVisibility.PUBLIC);
        method.setName("set" + camel);
        method.addParameter(new Parameter(PrimitiveTypeWrapper.getIntegerInstance(), name));
        method.addBodyLine("this." + name + "=" + name + ";");
        commentGenerator.addGeneralMethodComment(method, introspectedTable);
        topLevelClass.addMethod(method);
        method = new Method();
        method.setVisibility(JavaVisibility.PUBLIC);
        method.setReturnType(PrimitiveTypeWrapper.getIntegerInstance());
        method.setName("get" + camel);
        method.addBodyLine("return " + name + ";");
        commentGenerator.addGeneralMethodComment(method, introspectedTable);
        topLevelClass.addMethod(method);
    }

    /**
     * This plugin is always valid - no properties are required
     */
    @Override
    public boolean validate(List<String> warnings) {
        System.out.println("MybatisGenPaginationPlugin插件的validate执行了");
        return true;
    }

}
